Hi os008,
Some armor and weapons require an identification level of 2 in order for a player character to know what it really is and its properties.
From IGN website:
Identify (Passive)
Skill description
Much used by merchants, this skill grants you the ability to accurately evaluate the properties of items both magical and mundane.
In-game stats
Level 1: Objects with an identification level of 1 can be identified. Required Clvl: 1
Level 2: Objects with an identification level of 2 can be identified. Required Clvl: 5
Level 3: Objects with an identification level of 3 can be identified. Required Clvl: 9
Level 4: Objects with an identification level of 4 can be identified. Required Clvl: 13
Level 5: Objects with an identification level of 5 can be identified. Required Clvl: 17
Thanks.